A Case of Aortic Mural Thrombus Presenting as Recurrent Shoulder Pain Discovered by the Presence of Splinter Hemorrhages.

Progressive claudication of the upper extremity is uncommon and can be misattributed to cervical radiculopathy or even shoulder pathology, such as tendonitis or bursitis. We report a patient presenting to the emergency department with several months of worsening left upper-extremity pain initially managed as suspected radiculopathy, but, in retrospect, was upper-extremity claudication. This was discovered through the presence of lesions beneath the fingernails of the left hand, splinter hemorrhages. A computed tomographic angiography (CTA) of the chest for aortic and vascular evaluation demonstrated a mural thrombus partially occluding the left subclavian artery. The patient was admitted for further management and observation. Following initiation of systemic anticoagulation, symptoms had significantly improved, and the patient was discharged home in stable condition. This case underscores the diagnostic importance of bedside examination and vascular imaging when evaluating atypical upper-extremity claudication. This also highlights arterial thrombus as a potentially reversible cause of upper-extremity pain when promptly recognized and treated.